I managed to install Guitar Pro 6 on my desktop by using 32-bit dependencies, following the instructions here to install:

I followed the exact same methods on my laptop, but Guitar Pro 6 won't run.
I have tried the official demo from the website, which didn't work either.

When downgrading my libraries to 32-bit for Guitar Pro 6 install, at some point in the terminal it had an issue with LibGL, saying it was installed by the video driver.

I suspect this may be the cause of the problem, since after Googling for hours, the only issues were with libportaudio, which I downgraded successfully.

So, is there a way to downgrade LibGL to 32-bit, since it is installed with the video driver? Would this stop my display working, or is it impossible?

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I also tried installing the Windows version under Wine and PlayOnLinux, neither of which worked. Guitar Pro 6 installs successfully, but then nothing happens when I try to run it.

If I am wrong about LibGL, does anyone know a way I could get Guitar Pro 6 working? I desperately need it to work, and don't want to downgrade to 32-bit.

UPDATE: I ran /opt/GuitarPro6 !$ ldd ./GuitarPro and it reported that libGL.so.1 was 'not found'
I found the file(s) in the nvidia-current directory, and placed them in /usr/lib/i386-linux-gnu/mesa/
The issue now is, how can I tell Guitar Pro 6 where to find them?